kumquat-buildroot/support/dependencies/check-host-tar.sh
Yann E. MORIN c3af086395 support/dependencies: treat BSD-tar like the other cases
Currently, when we detect that tar is BSD-tar, we fake an unsupported
version (major, minor) and rely on the version check to reject BSD-tar.

There is no reason to use such shenanigans, when we can simply reject it
from the onset.

Simplify the logic:
  - use positive logic in the condition
  - directly exit in error

Also, comment that case like the other cases are commented.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2018-11-24 15:14:50 +01:00

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#!/bin/sh
candidate="$1"
tar=`which $candidate`
if [ ! -x "$tar" ]; then
tar=`which tar`
if [ ! -x "$tar" ]; then
# echo nothing: no suitable tar found
exit 1
fi
fi
# Output of 'tar --version' examples:
# tar (GNU tar) 1.15.1
# tar (GNU tar) 1.25
# bsdtar 2.8.3 - libarchive 2.8.3
version=`$tar --version | head -n 1 | sed 's/^.*\s\([0-9]\+\.\S\+\).*$/\1/'`
major=`echo "$version" | cut -d. -f1`
minor=`echo "$version" | cut -d. -f2`
bugfix=`echo "$version" | cut -d. -f3`
version_bsd=`$tar --version | grep 'bsdtar'`
# BSD tar does not have all the command-line options
if [ -n "${version_bsd}" ] ; then
# echo nothing: no suitable tar found
exit 1
fi
# Minimal version = 1.27 (previous versions do not correctly unpack archives
# containing hard-links if the --strip-components option is used or create
# different gnu long link headers for path elements > 100 characters).
major_min=1
minor_min=27
# Maximal version = 1.29 (1.30 changed --numeric-owner output for
# filenames > 100 characters). This is really a fix for a bug in
# earlier tar versions regarding deterministic output so it is
# unlikely to be reverted in later versions.
major_max=1
minor_max=29
if [ $major -lt $major_min -o $major -gt $major_max ]; then
# echo nothing: no suitable tar found
exit 1
fi
if [ $major -eq $major_min -a $minor -lt $minor_min ]; then
# echo nothing: no suitable tar found
exit 1
fi
if [ $major -eq $major_max -a $minor -gt $minor_max ]; then
# echo nothing: no suitable tar found
exit 1
fi
# valid
echo $tar